我正在创建一个移动应用程序，可以访问外部数据库来检索一些数据，但问题是在日志中我遇到错误可以任何人帮助我，我会很感激
如日志cat所示系统错误在* HttpResponse response = httpclient.execute（httppost）; *所以如何解决这个问题？
package com.taseen.apps;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.DefaultClientConnection;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.R.array;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class TestExternalDatabaseActivity extends Activity {
TextView resultView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.testexternaldatabase);
resultView =(TextView)findViewById(R.id.result);
getData();
}
public void getData()
{
String result = "";
InputStream isr = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("127.0.0.2/getAllCustomers.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
try {
isr = entity.getContent();
} catch (IllegalStateException e4) {
// TODO Auto-generated catch block
e4.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
Log.e("log-tag", "Error in connection"+e.toString());
resultView.setText("could not connect to database");
//convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(isr, "iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while((line = reader.readLine())!= null)
{
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
Log.e("Log-tag", "Error converting result" +e.toString());
//parse json data
try {
String s ="";
JSONArray jArray = new JSONArray(result);
for(int i = 0; i<jArray.length(); i++)
{
JSONObject json = jArray.getJSONObject(i);
s = s +
"Name: "+json.getString("FirstName")+" "+json.getString("LastName")+"\n"+
"Age: "+json.getString("Age")+"\n"+
"Mobile Used: "+json.getString("Mobile")+"\n\n";
}
resultView.setText(s);
} catch (JSONException e2) {
// TODO Auto-generated catch block
Log.e("log-tag", "Error parsing data"+e.toString());
}
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
} catch (IOException e5) {
// TODO Auto-generated catch block
e5.printStackTrace();
}
}
}
04-02 20:47:58.223: E/log-tag(699): before the first try
04-02 20:47:58.223: E/log-tag(699): after the httpclient
04-02 20:47:58.282: E/log-tag(699): after the httppostt
04-02 20:47:58.352: W/System.err(699): org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.2 refused
04-02 20:47:58.362: W/System.err(699): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:178)
04-02 20:47:58.362: W/System.err(699): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-02 20:47:58.362: W/System.err(699): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-02 20:47:58.362: W/System.err(699): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
04-02 20:47:58.372: W/System.err(699): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-02 20:47:58.372: W/System.err(699): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-02 20:47:58.372: W/System.err(699): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-02 20:47:58.372: W/System.err(699): at com.taseen.apps.TestExternalDatabaseActivity.getData(TestExternalDatabaseActivity.java:60)
04-02 20:47:58.372: W/System.err(699): at com.taseen.apps.TestExternalDatabaseActivity.onCreate(TestExternalDatabaseActivity.java:38)
04-02 20:47:58.372: W/System.err(699): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-02 20:47:58.372: W/System.err(699): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
04-02 20:47:58.372: W/System.err(699): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-02 20:47:58.475: W/System.err(699): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-02 20:47:58.475: W/System.err(699): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-02 20:47:58.475: W/System.err(699): at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 20:47:58.475: W/System.err(699): at android.os.Looper.loop(Looper.java:123)
04-02 20:47:58.475: W/System.err(699): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-02 20:47:58.475: W/System.err(699): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 20:47:58.475: W/System.err(699): at java.lang.reflect.Method.invoke(Method.java:507)
04-02 20:47:58.482: W/System.err(699): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-02 20:47:58.482: W/System.err(699): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-02 20:47:58.482: W/System.err(699): at dalvik.system.NativeStart.main(Native Method)
04-02 20:47:58.482: W/System.err(699): Caused by: java.net.ConnectException: /127.0.0.2:80 - Connection refused
04-02 20:47:58.493: W/System.err(699): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
04-02 20:47:58.493: W/System.err(699): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
04-02 20:47:58.493: W/System.err(699): at java.net.Socket.connect(Socket.java:983)
04-02 20:47:58.493: W/System.err(699): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
04-02 20:47:58.493: W/System.err(699): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
04-02 20:47:58.493: W/System.err(699): ... 21 more
04-02 20:47:58.493: E/log-tag(699): error in the get data function
<?php
$con = mysql_connect("localhost", "root", "root")or die(mysql_error());
mysql_select_db("TestDatabase", $con) or die("can not connect to the database");
$result = mysql_query("SELECT * FROM customer")or die(mysql_error());
while($row = mysql_fetch_assoc($result))
{
$output[] = $row;
}
print(json_encode($output));
mysql_close();
?>
答案 0 :(得分：0)
好的，我有一个类似的问题。
我解决了它如下
访问计算机中的cmd并键入ipconfig，获取您的IP地址并替换127.0.0.2
类似的东西（在我的电脑的情况下）：
HttpPost httppost = new HttpPost("192.168.0.5/getAllCustomers.php");
我把它搞定了
如果不能正常工作，请尝试关闭防病毒功能，在我的情况下，avast阻止了我的访问。